c d t - 3 3 4 8 p . 1 / 5 2001-08-08 ! d e u ! . ! 4 4 5 9 ! d m j o j d b m ! u i f s n p n f u f s ! ! a . f eatures : x . cmos process --- lower power consum ption. x . single 1.5v battery operation. x . bonding option for j / k m easurem ent. x . range of temperature f o r m easurem ent : +32.0 j ~ +42.0 j (+90.0 ~ +108.0 k ) x . resolution of m easured tem p erature : 0.1 j ( 0.1 k ) x . accuracy of m easur e d t e m p e r a t u r e : + 0.1 j ( + 0.2 k ) x . bonding option for m eas ured tim e : 4sec / 16sec x . single push button for on/off . x . holding highest tem p erature. x . alarm warning for fever . x . display the previous m easur ed tem p erature after power on. x . auto power of f after 8 minutes 40 sec. x . buzzer alarm s for power turn on an d of f. b . general description : the c3348 is a digital clinical therm o meter for m easuring body tem p erature. it provide the following functions : a. j or k display m ode. b. long m easured tim e for 16 sec or short m easured tim e for 4 sec. c. alarm warning for fever . d. auto power off . c. the thermom e ter for c3348 including following electronic com ponents : a. lcd display . b. on/off push button. c. therm i ster d. buzzer e. resistors f. capaci t o rs g. 1.5v battery .
c d t - 3 3 4 8 p . 2 / 5 2001-08-08 d . pad description : pin no. pin na m e i/o description 1 lowc b w h en connect to vss w ith resistor , supply voltage detected. 2 vss i for power supply ground. 3 sc b for referen ce and sensor resistor common point. 4 rf o for referen ce res i sto r to generate ref e rence c l ock . 5 rs o for sensor resistor to generate sensor clock. 6 vdd i for power supply +1.5v . 7 psw i pull-low , for power on/off switching. 8 t e s t 2 i connect to vdd, l c d displays the highest value, floating this pin, l c d displays real tim e temperature f o r production. 9 c l f h i connect to vdd for k , floating for j . 1 0 osci i system oscilla tor in. 1 1 osco o system oscilla tor ou t . 1 2 bz1 o buzzer output 1 . 1 3 bz2 o buzzer output 2 . 1 4 c o m 1 o 1 5 c o m 2 o 1 6 c o m 3 o for lcd c o mm on pin output. 1 7 s a 1 o 1 8 s a 2 o 1 9 s a 3 o 2 0 s b 1 o 2 1 s b 2 o 2 2 s b 3 o 2 3 s c 1 o 2 4 s c 2 o 2 5 s c 3 o 2 6 s d 1 o for lcd s e gm ent drive. 27 vee o negative voltage for l c d. 28 cap o for negative voltage generator . 29 c512 o for negative voltage generator . 3 0 plusout o t e st pin. 3 1 test2in i t e st ping. 3 2 test1 i t e st ping. 3 3 t e s t s e c i floating for 16 sec m easurem ent, vdd for 4 se c m easurem ent. e . absolute maxim u m ratings : supply voltage ? 0v to 3v input voltage ? vss-0.5v to vdd+0.5 v operation tem p eratu r e ? -20 j to 75 j storag e tem p erature ? -55 j to 125 j note : these are stress ratings onl y . stresses exc eeding the ra nge s p ecified u n d er ?a bs ol ut e m a xi m u m r a t i n gs? m a y cause s u bst a nt i a l dam a ge t o t h e de vi ce. f unct i o nal ope r a t i on of t h i s de vi ce at o t h e r co nd i tio n s b e yond t h ose listed in th e sp ecif i cation is no t im p lie d an d pro l on g e d ex po su r e t o ex trem e co nd itio ns m a y af fect d e v i ce reliab ilit y .
c d t - 3 3 4 8 p . 3 / 5 2001-08-08 f . e l ectrical charact eristics : (t a = 2 5 j ) t e st condition sy m b o l p a r a m e t e r v dd c o n d i t i o n m i n . t y p . m a x . u n i t . v dd ope r ating v o l t age vdd ?e 1. 3 1 . 5 1. 7 v i dd o p e r at i n g c u rre nt 1. 5v no l o adi ng ?e 6 0 1 0 0 a i st st an d - by c u r r ent 1. 5v ?e ?e 1 . 0 a f osc system oscillator fre quency 1.5v ro sc = 91 0k [ ?e 3 3 4 0 k h z i bz1 b u zze r out put cu rre nt 1. 5v v oh = 1v 10 12 14 m a i bz2 b u zze r out put cu rre nt 1. 5v v ol = 0. 5v 10 12 14 m a l owc l o w power s u pply detected 1.5v r lo w c = 4 10k [ 1. 2 5 1 . 3 5 1. 4 5 v g . f u n c t i o n d e s c r i p t i o n : 1. push psw button to turn power on or of f. 2. when push psw to turn power on. buzzer will generate a ?beep? sound for 0.125 sec. after ?beep ?, the sequencial ac tion as following steps. step1 : display all segm e n ts on for 2 sec. step2 : after step1, then di splay the last tim e m e asured tem p erature for 2 sec. step3 : display j or k for 0.75 sec. step4 : j or k m a rk will f l ash a t speed of 1hz and sta r t to m easure a nd display tem p erature. step5 : if th e tem p eratur e is le ss than 32 j ( or 90 k ), the display will show l j or l k . step6 : if th e tem p eratur e is lar g e tha n 42 j ( or 108 k ), the display will show h j or h k . step7 : lcd display always shows the highest temperature d u ring the temperature m easurem ent. step8 : if th e m easured tem p erature does not change for m o re than 16 sec (or 4 sec), the m easurem ent will s t op a nd j ( or k ) m a rk will cea se f l ash. step9 : w h e n end of m e asured tem p erat ure, if the tem p erature is lar g e than 37.5 j (99.5 k ) the buzzer will alarm s : ? bee p ------ b eep ------ b eep - ----- beep ------ be ep ------ beep ------ 0. 125s 0. 125s 0. 375s 0. 1 25s 0. 125 s 0. 375s 0 . 1 2 5 s 0 . 1 2 5 s 0 . 1 2 5 s 0 . 1 2 5 s 0 . 1 2 5 s 0 . 1 2 5 s for 4 sec, if the temperature is less th an 37 .6 j ( or 99.6 k ) the b u zzer will a l ar m s as f o llows : ? b e ep ----------- - - - f o r 4 s e c 0.5s 0.5s
c d t - 3 3 4 8 p . 4 / 5 2001-08-08 step10 : w h en end of measurem ent, and if the temperature rises in 8 m i nutes 4 0 s e c , t h e j ( or k ) mark will f l a s h again ( rep eat f r om step 4, and the counter of 8 m i nutes 40 sec will start to coun t again from zero. step1 1 : w h en m easured tem p erature does not change for 8 minutes 40 sec, the power will turn of f autom a ticlly . step12 : the tem p erature does not m e asure during beep alarm . step13 : when battery voltage is low , the battery m a rk ? will f l ashes at the sp eed of 1hz, and the m easured tem p erature m a y not be accurate. t h e l o w v o l t a g e d e t e c t : 1 . 3 5 + 0.05v 3. bonding option for j?b k . 4. bonding option for tim e of m easured tem p erature for 4 sec or 16 sec. 5. sensor use 503et . 6. reference resistor is th e value of sensor at 37.0 . 7. during the process of m a ss production, in or der to adjust the reference resistance (rf), let test 2 be f l oatin g, the lcd will di sp lay the rea l pre s ent tem p erature not always sho w the highes t tem p erature of m easurem ent. h . lcd electr ode patter n : a1 h1 h1 b1 c1 d1 e1 f1 a2 b2 c2 d2 e2 f2 a3 b3 c3 d3 e3 f3 h2 b4 c4 a4 h3 g1 g2 g3 s a 1 s a 2 s a 3 s b 1 s b 2 s b 3 s c 1 s c 2 s c 3 s d 1 c o m 1 f 1 a 1 b 1 f 2 a 2 b 2 f 3 a 3 b 3 a 4 c o m 2 e 1 g 1 c 1 e 2 g 2 c 2 e 3 g 3 c 3 b 4 c o m 3 h 1 d 1 o o d 2 h 2 o d 3 h 3 c 4 n o t e . 1/ 3 d u t y , 1 / 2 bi as (lc d u s es 3 v )
c d t - 3 3 4 8 p . 5 / 5 2001-08-05 i . pad assignment : vss lowc testsec vee test1 test2in plusout c512 sc rf cap rs vdd psw test2 com2 com1 com3 sa2 sa1 sa3 sb2 sb1 sb3 sc1 sc3 sc2 sd1 d e u . 4 4 5 9 osci clfh osco bz2 bz1 a : 0 , 0 b : 2580 , 2380 chip size : 2660 * 2460 um j . application circuits : vss lowc testsec vee test1 test2in plusout c512 sc rf cap rs vdd psw test2 com2 com1 com3 sa2 sa1 sa3 sb2 sb1 sb3 sc1 sc3 sc2 sd1 d e u . 4 4 5 9 osci clfh osco bz2 bz1 0.022uf 0.022uf ref sensor rosc = 910k buzzer 1.5v battery 2200~2700pf 400k vdd vdd
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